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In an area having sandy soil, 50 small trees of a certain type were planted, and another 50 trees were planted in an area having clay soil. Let X = the number of trees planted in sandy soil that survive 1 year and Y = the number of trees planted in clay soil that survive 1 year. If the probability that a tree planted in sandy soil will survive 1 year is .7 and the probability of 1-year survival in clay soil is .6, compute an approximation to P(-5 X - Y 5) (do not bother with the continuity correction). and with the other parameter equal to a1 + a2. Is X + Y gamma distributed if the scale parameters are different? Explain.
a web based software company is interested in estimating the proportion of individuals who use the firefox browser. in
one class of 40 students complain that they were harshly graded in the examination as l0 students received A or B ; 17 received a C ; and the rest received a D or lower. QUESTION: Is the class's complain about harsher grading justified? ( use a : 0..
a recent report indicated an average family of four 2 parents and 2 children under the age of 16 spends 500 per month
The objective is to maximize the expected net return. Define the optimal value function and give the optimality equation. Find the optimal policy.
suppose a sample of 19 scores has a mean of 67.43. two additional scores are added to the sample with values of 64.4
to give a 99.9 confidence interval for a population mean ? you would use the critical valuea.z 2.576.b.z 1.960.c.z
What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
If the measurements are assumed to come from normally distributed populations with equal variances, estimate the difference between the population means, with con?dence coef?cient 0.95, and interpret.
Calculate the mean salary of the CFOs and base on measures of the center of the data; determine if the CFO salary data are skewed.
a new phone answering system installed by the ohio power company is capable of handling 5 calls every ten minutes.
At the 0.01 significance level, can we conclude that the mean number of patients per day is more than 25? Estimate the p-value and interpret it.
a person has six guns. the probability of hitting a target when these guns are properly aimed and fired is 0.6 0.5
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